Coal gangue powder-based grouting material for pavement voids and preparation method of coal gangue powder-based grouting material

Abstract

The invention discloses a coal gangue powder-based grouting material for pavement voids and a preparation method of the coal gangue powder-based grouting material. Gravel is used as a supporting material to improve the overall strength of the grouting material, coal gangue powder, slag powder and coal ash are added, and an alkaline activator is used for activation of the above materials so as to prepare a material with gelling capacity; the gravel is used as a filling material to support a void area of a pavement, and the coal gangue powder and other powder can permeate into fine pores of thegravel, so the grouting material and a pavement structure are bonded into a whole through the permeation of fine materials; and a solution prepared from a sodium silicate solution and a NaOH solid isadopted, active silicon, aluminum and calcium substances in the coal gangue powder, the slag powder and the coal ash are dissolved by using the sodium silicate solution and KOH and then re-aggregatedto form a solution composed of C-S-H hydrated calcium silicate, a C-S-A-H hydrated calcium aluminosilicate hydration product, the sodium silicate solution and KOH, and the formed solution enables thecoal gangue powder and aluminum oxide in the slag powder to react firstly, can prevent too fast coagulation caused by too much coal ash, and the working performance of the grouting material is improved.

Description

technical field [0001] The invention relates to the field of road grouting materials, in particular to a coal gangue powder-based grouting material used for road surface voiding and a preparation method thereof. Background technique [0002] With the development of road construction, a considerable number of cement concrete pavements are built in all levels of roads in my country. Cement pavement has many advantages such as good durability, large bearing capacity, and simple construction machinery. Due to the existence of cement pavement joints, water can easily enter the bottom of the cement pavement slab. At the same time, under the repeated action of vehicle loads, the water at the bottom of the slab forms high-pressure dynamic water that continuously scours the pavement slab and the base layer, causing fine particles in the base material to escape from the gaps between the slabs. Spew out to form pumping disease. Slurry disease will lead to voids formed by continuous er...

AI Technical Summary

Problems solved by technology

But every ton of cement produced will release 1 ton of CO 2 , and with the emission of a large amount of NO x , SO x and dust, the production of cement consumes a lot of energy and causes great damage to the ecological environment

The bleeding rate of the cement slurry material is high, which is easy to cause the precipitated water to enter the base layer and aggravate the water damage

[0004] On the other hand, my country produces a large amount of industrial waste every year, such as blast furnace slag powder, fly ash, steel slag, etc. Stacking not only occupies a large amount of land, but also easily causes spontaneous combustion to pollute the environment

Moreover, the current comprehensive utilization of coal gangue is far from enough, resulting in a large amount of coal gangue that cannot be effectively utilized and piled up in large quantities

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